- 1981 - First cases of
acquired immune deficiency syndrome (AIDS) reported.
- 1983 - Agent now known
to be responsible for AIDS called human immunodeficiency virus
(HIV), was isolated and identified.
- There are at least two
types of HIV, HIV-2 which is mainly found in West Africa, and
HIV-1 which is more virulent and causes the most AIDS worldwide.
- HIV generally leads
to a depletion of CD4
T cells (a type of white blood cell).
- As of January 1999,
there were an estimated 30 to 40 million cases of HIV worldwide
- The number of infected
people worldwide continues to grow at an alarming rate: